I have put two pics in my Images.xcassets. I use these pics as tab bar icons. My problem: These Tab Bar Icons only show up on my iPhone 5s. Not on my iPad and not on my iPhone 4s. What's the problem with this?
Do I have to add a picture where it says "All"? I can't add any pictures there!

I have a UIScrollView. My problem is that I can only scroll down on my iPhone 5s. It neither works on my iPhone 4s than on my iPad 3. I'm using these constraints: